Evaluation of Safety Performance of Fractured Joints in Steel Truss Bridge

Yi Yi Mon, San Yu Khaing

Abstract


This study aims to evaluate safety performance of fractured joints and failure mechanisms of high-strength friction-grip (HSFG) bolted connections in steel bridge. As a case study, the bolted connections on the Ayeyarwady Bridge (Yadanarbon) in Myanmar have been investigated. Initial inspection of the bridge found that a number of bolts were loosened, missing or had already fractured and most were heavily corroded. The original fractured bolts have been replaced with the new ones as remedial work. The safety performance of fractured joints were evaluated based on simulation results of existing bridge by Midas Civil in accordance with AASHTO standards. The failure mechanisms of the fractured bolts were investigated by analyzing through optical and scanned electron microscopy. The main factors contributed to the failure of the bolted connections at the Ayeyarwady Bridge (Yadanarbon) include delayed fracture, stress corrosion cracking, the fluctuating loads, and the corrosive environment it was subjected to. The failure mechanisms of the fractured bolts were mainly due to pitting corrosion and fretting fatigue. 


Keywords


highway bridge; HSFG bolts; modes of failure.

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References


Bridge Inspection Manual for Steel Truss Bridge (Special Bridge) (2014)

Bickford, J. H.: “An introduction to the design and behavior of bolted joints -3rd edition, revised and expanded”, Marcel Dekker, Inc., New York, USA, 1995

Public Works, Maintenance Reports (2014)

Highway Technology Research Center, Metropolitan Expressway, Japan, Field Investigation Result Report of Yadanarbon Bridge (2014)

Inspection and Maintenance Reports of Public Works of Ministry of Construction

MIDAS CIVIL, Version 2011, Midas Information and Technology Co. Ltd

AASHTO. 2010. AASHTO LRFD Bridge Design Specifications, 5th Edition, American Association of State Highway and Transportation Officials, Washington, DC


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